열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제33권3호
  • /
  • Pages.107-116
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  • 2020
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  • 1225-1070(pISSN)
  • /
  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
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인장강도 1200 MPa 급 자동차 서브 프레임의 합금성분 최적화 및 열변형 거동 연구

A Study on Dimensional Change after Heat Treatment and Optimal Chemical Composition of Steels with 1200 MPa Tensile Strength for Automotive Subframe

  • 정우창 (대구가톨릭대학교 기계자동차공학부)
  • Jeong, Woo Chang (School of Mechanical and Automotive Engineering, Daegu Catholic University)
  • 투고 : 2020.04.16
  • 심사 : 2020.04.28
  • 발행 : 2020.05.30
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초록

Four air hardening steels with carbon, silicon, manganese, chromium, and molybdenum variations have been used in this study to find out the optimal chemical compositions of steels with over 1200 MPa tensile strength for automotive subframe. The dimensional changes after heat treatment were determined for two automotive parts with open and closed cross sections using 3D scanner. When four steels were austenitized at 900℃ for 30 seconds, cooled at 3℃/s, reheated to 450℃ for 10 seconds followed by air cooling to simulate hot-dip galvanizing treatment showed ultra high tensile strength over 1200 MPa. Rear floor cross member with open cross section revealed much bigger dimensional changes than subframe with closed cross section after heat treatment at 900℃ for 20 minutes followed by air cooling.

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참고문헌

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